Table 1 Sociodemographic and clinical characteristics of participants by retention status

Sociodemographic

Age (years)

62.3 ± 11.1

62.4 ± 11.1

62.0 ± 10.8

0.729

Sex (% Male)

460 (75.4%)

365 (74.3%)

95 (79.7%)

0.212

Nationality (% Han)

605 (99.3%)

487 (99.2%)

118 (99.2%)

0.325

Insurance

0.006

Employee medical insurance

251 (41.2%)

215 (43.8%)

36 (30.5%)

Urban residents’ medical insurance

296 (48.6%)

223 (45.4%)

73 (61.9%)

Public or rural cooperative medical care

12 (1.9%)

8 (1.6%)

4 (3.4%)

Self-pay

50 (8.2%)

45 (9.2%)

5 (4.2%)

Clinical

Cardiac history

Previous MI

44 (7.2%)

28 (5.7%)

16 (13.4%)

0.001

Previous HF

6 (1.0%)

2 (0.4%)

4 (3.4%)

0.004

Previous valve procedure

3 (0.5%)

2 (0.4%)

1 (0.8%)

0.053

Previous PCI

82 (13.4%)

55 (11.2%)

27 (22.7%)

< 0.001

Previous CABG

2 (0.3%)

2 (0.4%)

0

0.074

Comorbidities

Cerebrovascular Disease

50 (8.6%)

40 (8.1%)

10 (8.4%)

0.126

Kidney disease requiring dialysis

1 (0.2%)

0

1 (0.8%)

0.038

Peripheral arterial disease

0

0

0

–

Lung disease

18 (3.0%)

11 (2.2%)

7 (5.9%)

0.013

PCI information

Indication for PCI

< 0.001

Acute coronary syndrome

318 (52.1%)

287 (58.9%)

31 (26.5%)

Atherosclerotic lesions in coronary arteries without ACS

284 (46.6%)

198 (40.7%)

86 (73.5%)

Culprit vessel

< 0.001

Left main

5 (0.8%)

3 (0.6%)

2 (1.7%)

Right coronary artery

105 (17.2%)

76 (15.5%)

29 (24.4%)

Left circumflex

91 (14.9%)

63 (12.8%)

28 (23.5%)

Left anterior descending

208 (34.1%)

163 (33.2%)

45 (37.8%)

More than 2 vascular lesions

201 (33.0%)

186 (37.9%)

15 (12.6%)

Other

Degree of stenosis

91.6 ± 12.8

92.2 ± 12.6

89.5 ± 13.7

0.060

Troponin

2.0 ± 7.6

2.0 ± 8.2

1.7 ± 4.2

0.656

D-dimer

2.7 ± 4.3

4.5 ± 0.2

0.6 ± 0.1

< 0.001

Risk factors

Hypertension

396 (64.9%)

315 (64.2%)

81 (68.1%)

0.655

Dyslipidemia

224 (36.7%)

172 (35.0%)

52 (43.7%)

0.078

Body mass index

24.8 ± 3.4

24.9 ± 3.4

24.8 ± 3.3

0.729

Smoking in past year

230 (37.7%)

185 (37.7%)

45 (37.8%)

0.978

Family history of premature onset CVD

174 (28.5%)

142 (28.9%)

32 (26.9%)

0.117

Diabetes

195 (32.0%)

156 (31.8%)

39 (32.8%)

0.834

Fasting blood glucose

7.1 ± 3.5

7.1 ± 3.7

6.7 ± 2.4

0.332

HbA1_c

6.5 ± 3.1

6.4 ± 3.4

6.6 ± 1.5

0.626

C-reactive protein

10.7 ± 66.8

12.1 ± 74.6

5.5 ± 15.1

0.410

Disease severity indicators/other clinical factors

Heart rate (bpm)

74.5 ± 11.2

74.5 ± 11.5

74.5 ± 10.2

0.969

Killip class

< 0.001

Class 1

368 (60.3%)

327 (90.3%)

41 (50.6%)

Class II

61 (10.0%)

26 (7.2%)

35 (43.2%)

Class III

2 (0.3%)

2 (0.5%)

0

Barthel index^a

81.0 ± 23.7

78.1 ± 24.7

92.3 ± 13.6

0.007

Ejection fraction

31.4 ± 71.6

29.3 ± 74.2

55.8 ± 18.8

< 0.001

BNP

291.0 ± 906.7

220.8 ± 579.6

622.1 ± 1734.3

< 0.001

Length of stay (days)

6.6 ± 3.3

6.5 ± 3.1

6.9 ± 3.9

0.262

Medications

Anti-platelets

605 (99.2%)

487 (99.2%)

118 (99.2%)

0.545

Lipid-lowering

580 (95.1%)

477 (97.2%)

103 (86.6%)

< 0.001

Anti-hypertensives

505 (82.9%)

414 (84.3%)

91 (77.1%)

< 0.001

ACE inhibitors

278 (45.6%)

226 (46.0%)

52 (43.7%)

0.214

Anti-arrhythmics

31 (5.1%)

23 (4.7%)

8 (6.7%)

0.251

Proton pump inhibitors

143 (23.4%)

107 (21.8%)

36 (30.3%)

< 0.001